The Panofsky turkey constant

November 26, 2008 | 12:06 pm

Just in time for the Thanksgiving holiday, Nicholas Panofsky shares a flavorful tidbit of Panofsky family lore. 

“There was a point in time when my grandfather [SLAC Director Emeritus] WKH ‘Pief’ Panofsky was not satisfied with the cooking times for turkeys of ’30 minutes per pound’,” Panofsky wrote. “This is of course reasonable, because the time a turkey should be cooked is not a linear equation.”

So Pief Panofsky derived an equation based on the ratio between the surface area and mass of a turkey. Cooking time for a stuffed turkey in a 325 °F oven is given by

t = W(2/3)/1.5

where t is the cooking time in hours and W is the weight of the stuffed turkey, in pounds. The constant 1.5 was determined empirically.

This story first appeared in SLAC Today.

Shawne Workman

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Hanny's voorwerp explained

November 26, 2008 | 10:48 am

WSRT observations reveal a radio jet (white contours) emanating from the centre of the nearby galaxy IC 2497, headed straight in the direction of Hanny's Voorwerp (green). The observations also reveal a huge reservoir of hydrogen gas (coloured orange) that probably arose from a previous encounter between IC2497 and another galaxy. The presence of strong neutral hydrogen absorption (top right plot) argues that the central regions of IC2497 are highly obscured. Credit: Main image left and top right hand corner (ASTRON). Hanny's voorwerp (bottom right) Dan Herbert, Isaac Newton Telescope.

Westerbork Synthesis Radio Telescope observations reveal a radio jet (white contours) emanating from the centre of the nearby galaxy IC 2497, headed straight in the direction of Hanny's Voorwerp (green). The observations also reveal a huge reservoir of hydrogen gas (coloured orange) that probably arose from a previous encounter between IC2497 and another galaxy. The presence of strong neutral hydrogen absorption (top right plot) argues that the central regions of IC2497 are highly obscured. Credit: Main image left and top right hand corner (ASTRON). Hanny's voorwerp (bottom right) Dan Herbert, Isaac Newton Telescope.

Hanny’s voorwerp, a mysterious giant green astronomical object found over a year ago now has a partial explanation, according to a press release from Astron, the Netherlands Institute for Radio Astronomy. It seems that a jet of energetic particles from a nearby black hole has cleared a path in the interstellar medium so that visible and ultraviolet light associated with the black hole can heat the cloud, ionizing the particles, and causing it to glow green.

Hanny var Arkel is a Dutch schoolteacher who found the object while participating in the Galazy Zoo project, which asks members of the public to look at numerous astronomical objects and classify them into different types of galaxies.

The object now known as Hanny’s voorwerp (voorwerp means object in Dutch), is labelled by astronomers SDSS J094103.80+344334.2, a number referencing the Sloan Digital Sky Survey data set. The black hole resides at the center of the galaxy IC 2497, which is about 60,000 light years away from Hanny’s voorwerp.

In the press release, Dr. Tom Oosterloo says he thinks he has seen such a phenomenon before: “It has all the hallmarks of an interacting system–the gas probably arises from a tidal interaction between IC 2497 and another galaxy, several hundred million years ago”. Oosterloo also thinks he can identify the culprits, “the stream of gas ends three hundred thousand light years westwards of IC2497–all the evidence points towards a group of galaxies at the tip of the stream being responsible for this freak cosmic accident”.

David Harris

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Reactions to the Dark Universe Debate

November 26, 2008 | 8:11 am

The new issue of symmetry features a debate between Fermilab particle physicist Joe Lykken and University of Chicago astrophysicist Rocky Kolb. The topic: which field will explain dark matter or dark energy first?

See how the audience responded in this video.

Kathryn Grim

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Fermilab: Advancing science on tight budgets

November 25, 2008 | 11:52 am

Adrienne Kolb

Adrienne Kolb knows a lot about the 40-year history of Fermi National Accelerator Laboratory in Batavia, Illinois: She’s the laboratory’s archivist and heads its History and Archives Project.

This month, Kolb introduced her book Fermilab: Physics, the Frontier & Megascience, which she coauthored with Lillian Hoddeson and Catherine Westfall. Almost 500 people attended her public lecture (see video) and book presentation at Fermilab, and many of them lined up after her talk to have her sign a copy of her book.

Kolb has worked at Fermilab since 1983. Her book focuses on the first two decades at Fermilab. Through her studies she’s gained a deep appreciation of the work of founding director Robert Wilson.

“I hate to say this because of the [Presidential election] campaign rhetoric of the last few months, but Wilson was a real maverick,” she said during her lecture. “He believed physicists could do everything.”

Robert Rathbun Wilson

There was lots of work to be done when the federal government decided in 1965 to build a new national laboratory about 40 miles west of Chicago. Wilson was appointed director in 1967–according to Kolb a “surprise choice,” since Wilson had criticized the design of the accelerators to be built.

Wilson struggled to attract scientists to the new laboratory. Professors from the East and West coasts hesitated to come to the Midwest and were worried that the new laboratory would be a secretive place with classified research. But Wilson had a different vision for the lab on the prairie.

“He promised to build an open lab, not classified as was Los Alamos,” said Kolb, a place “open to all physicists with respectable ideas for experiments.”

In a Congressional authorization hearing in 1969, Wilson made clear that the new laboratory would not carry out weapons research. Responding to a question about what the new laboratory would offer for national defense, he famously said, “It has nothing to do directly with defending our country except to make it worth defending.”

The first scientists moved into houses on the laboratory site in 1968. “It was rather desolate, but most frontier posts have modest beginnings,” Kolb said in her lecture. There were “years of lean budgets and uncertainty” and “money came in increments, always less than promised.”

Construction of the main ring at Fermilab

Despite these challenges, the laboratory continued to grow. The groundbreaking for the four-mile Main Ring tunnel, which today houses the Tevatron particle collider, took place in October 1969. Two years later, Wilson received more than 200 proposals from scientists all over the world for experiments to be conducted with the new particle accelerator.

On March 1, 1972, the Main Ring accelerator achieved its first beam, “ahead of schedule and for less money than had been budgeted,” said Kolb. Five years later, a team of physicists led by Leon Lederman made the first big discovery at the laboratory: the bottom quark.

But in 1978, Fermilab was again in a tough financial situation. There was no money for the next accelerator. Kolb said the Department of Energy favored the construction of a new accelerator at Brookhaven National Laboratory. Wilson resigned and “Fermilab was in drift,” Kolb said. A year later, Director Leon Lederman secured funding for the new accelerator, which had been proposed to double the energy of the Main Ring accelerator. The Tevatron–initially named the Energy Doubler–was born.

In 1983, the Tevatron became the world’s highest-energy accelerator, and it still is. Its beams have led to the discovery of the top quark (1995), the tau neutrino (2000), and several composite particles made of quarks, and have provided insight into numerous processes involving the subatomic forces of nature.

But the Tevatron’s days are numbered. In 2009, the Large Hadron Collider at the European laboratory CERN will achieve beams with even higher energy, and Fermilab plans to shut down the Tevatron in 2010. While Fermilab has plans for a new accelerator project, funding for the project still has to come.

This, however, is not the first time that budgets have been tight at Fermilab before the launch of a new project. History seems to repeat itself.

Kurt Riesselmann

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New issue of symmetry published

November 25, 2008 | 10:49 am

isymmetry/i magazine - November 2008

symmetry magazine - November 2008

The latest issue of symmetry has been published online and will be on the way to subscribers in the next few days. (You can always get to the current print issue by clicking on the “View Current Issue” label at the top right of this page, or go direct to www.symmetrymagazine.org.)

In this issue, you can read about how BaBar physicists at SLAC found the long-sought bottom-most bottomonium particle, and one of our intrepid reporters caught up with that particle, known as eta sub b, for an interview.

Well-known physicists Rocky Kolb and Joe Lykken went head-to-head in a debate about who would be first to reveal the nature of the dark universe, egged on by fight referee Michael Turner.

Old physics equipment never dies, it just… well, read the story and find out just what happens to the remains of retired particle physics equipment at Fermilab.

Also in this issue, see the logbook entry for the first LHC beams, the meaning of a magnet quench in 60 seconds, a provocative commentary about forecasting LHC results, and our usual selections of short takes on the life and culture of the particle physics world in signal to background.

Here is a summary of the issue in pictures!

David Harris

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The Atom Smashers physics documentary airs Nov. 25

November 24, 2008 | 3:48 pm

The Atom Smashers documentary airs Tuesday, November 24, 2008, on PBS stations.

Tuesday, PBS airs the documentary The Atom Smashers, which chronicles the lives of scientists at Fermi National Accelerator Laboratory as they face dwindling federal research budgets, a waning public interest in basic science and fierce competition from Europe’s Large Hadron Collider to find the next big discovery.

Amidst all the challenges, the scientists manage to maintain families, social connections and excitement about their careers and the search for the Higgs boson, which lead character and Nobel Prize winner Leon Lederman dubbed the “God Particle.”

The film has a lesson not just about science but how to have a life worth living.

To learn about the motivation behind the film and about the scientists, see a previous symmetry breaking post.

You can also find out more about PBS and its decision to highlight the film on Independent Lens.

Independent Lens is broadcast on most PBS stations at 10 p.m. on Tuesdays, but put your zip code into the broadcast schedule to make sure dates and times do not vary in with your local PBS station. In the Chicago area, the show broadcasts at 10:30 p.m. on Channel 11.

If you want a second opinion, read a review from the Canadian publication Variety and from the science blog peculiar velocity and from an Illinois newspaper columnist who took her teenage relatives to a special showing at Fermilab to see their reaction. They loved it.

Tona Kunz

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Demand grows, wages rise for skilled workers in physics-related industry

November 21, 2008 | 5:34 am

It’s one thing to bemoan the decline of science and math education or scientific illiteracy among adults. It’s quite another to put some sweat into working toward a solution.

 Meyer Tool and Manufacturing  and the Cryogenics Society of America demonstrated just how to do that last week during an open house in Oak Lawn, Illinois.

They offered an interactive tour of the cryogenic and high-vacuum manufacturing factory, information about careers in manufacturing and engineering and a presentation by Fermilab’s Mr. Freeze, a persona adopted by physicist Jerry Zimmerman for cryogenics demonstrations aimed at teaching school children how liquid nitrogen works and how it is used at the particle physics laboratory .

The open house was part of the year-long Science Chicago outreach extravaganza. It seeks to create enthusiasm for science, math and science education by highlighting science activities, research and career opportunities in the Chicago area.

Meyer Tool has worked with Fermilab to develop high-tech equipment for the Large Hadron Collider at CERN, the European particle physics laboratory.  The United States is a major partner in LHC research, and Fermilab hosts a remote operation center for one of the accelerator’s major particles detectors, known as CMS for Compact Muon Solenoid.

While Meyer Tool provides products for both US-based and European-based experiments, the company also advocates a strong role for science on American soil, as evidenced by excerpts from its press release for the open house.

This event is important on many levels. A push to strengthen math and
science knowledge in the United States is a critical part of our
national agenda to keep America competitive as a nation into the future.
The sponsors believe that continued strength in manufacturing is also
key to the nation’s success. Without protecting our ability to create
and manufacture here in the States, we will become overly dependent on
foreign sources who, as China’s recent troubles highlight, may not
adhere to the same safety or quality standards as Americans expect.

With so much manufacturing going overseas and the skilled-trades workforce graying here at home, company officials say they feel an obligation to get the word out. “We want people to know that manufacturing is still going strong,” says Eileen Cunningham, president of Meyer. “We want people to realize that manufacturing offers viable career choices that are in high demand and provide an opportunity to earn a good living.”

The current skills shortage in manufacturing-related trades is expected to worsen over time as talented workers hit retirement age with no one to replace them. Schools have cut shop programs, and most parents want their children to go to college rather than go into the trades.  This labor shortage has caused wages to rise, a trend that is likely to continue.

Tona Kunz

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Chinese premier commends US/China collaboration

November 20, 2008 | 6:21 pm

Premier Wen meets the US delegates at IHEP

Premier Wen meets the US delegates at IHEP

The 29th annual meeting of the US/People’s Republic of China Joint Committee on High Energy Physics had an unexpected guest this year. On Nov. 4, the Premier of China, Wen Jiabao, visited the Institute of High Energy Physics in Beijing and met the US delegates. Premier Wen congratulated IHEP on their recently completed upgrade of the Beijing Electron Positron Collider. He also emphasized the importance of collaboration between the two nations.

“Premier Wen voiced appreciation for the strength and longevity of the collaboration,” said Jerry Blazey, a member of the US delegation from the Department of Energy. “He expressed a desire for continued and broadened collaborations and cited the efforts as a leading example of broader Sino-American relations.”

The US/PRC Joint Committee on High Energy Physics started in 1979 when Deng Xiaoping, the leader of China from the late seventies to the early nineties, visited the United States to meet with President Jimmy Carter. At this historical meeting, Carter and Xiaoping signed an agreement for cooperation on science and technology.

“It played an extremely important role for high energy physics in China,” said Yifang Wang, an associate director at IHEP. “With the help of the US through this channel, China built the Beijing Electron Positron Collider and the Beijing Spectrometer in the 1980s.”

Today the Daya Bay Reactor Neutrino Experiment represents the major collaborative effort between the two nations. Currently under construction in China, Daya Bay will use anti-neutrinos produced by the reactors of the Daya Bay Nuclear Power Plant and the Ling Ao Nuclear Power Plant to measure the last unknown neutrino mixing angle. Commissioning will begin in 2010.

Other current collaborative projects include the Beijing Electron Positron Collider II, the China Spallation Neutron Source and the Shanghai Light Source.

At the recent meeting, the delegations signed the official US-PRC agreement for 2009. The agreement outlines collaborative activities for the next year, which include exchange visits, contributions to ongoing projects, such as the Beijing Spectrometer III, and plans for future work on superconducting radiofrequency technology.

Here’s a video that a Chinese television station aired about Premier Wen’s visit.

Elizabeth Clements

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Gorgeous physics photos from the LIFE archives

November 19, 2008 | 7:41 pm

 

 

 

 

Yesterday’s release of two million photos from the LIFE magazine archives — most of which had never been seen by the public before — has no doubt set off a global treasure hunt.  Google is digitizing the entire 10-million-photo archive and making it available through its image search.  From the announcement on googleblog:

The Zapruder film of the Kennedy assassination; The Mansell Collection from London; Dahlstrom glass plates of New York and environs from the 1880s; and the entire works left to the collection from LIFE photographers Alfred Eisenstaedt, Gjon Mili, and Nina Leen. These are just some of the things you’ll see in Google Image Search today.

We’re excited to announce the availability of never-before-seen images from the LIFE photo archive. This effort to bring offline images online was inspired by our mission to organize all the world’s information and make it universally accessible and useful. This collection of newly-digitized images includes photos and etchings produced and owned by LIFE dating all the way back to the 1750s.

Only a very small percentage of these images have ever been published. The rest have been sitting in dusty archives in the form of negatives, slides, glass plates, etchings, and prints.

Fermilab physicist Bill Higgins has posted several choice nuggets on his blog, Eponymously Yours, W. Skeffington Higgins, including the photograph of the Berkeley cyclotron control room above, shot by Peter Stackpole in 1939.

Looks like this initial batch reaches only into the 1970s;  there are no images of the Tevatron accelerator at Fermilab or the SLAC linear collider, let alone the Large Hadron Collider on the Swiss-French border, which is scheduled to re-open next summer.

But there are some lovely sights amongst the older stuff:

The tracks of particles emanating from a speck of radium placed on a photographic plate, 1949.

     A chain of nails held together by a powerful magnetic field at Columbia University’s new cyclotron in 1948.

A cartoon tacked to a Berkeley cyclotron bulletin board, 1939.  In front of a wrecked cyclotron,  one scientist says to another, “Toughest damn atom I ever saw!”

 Cyclotron inventor and Nobel laureate EO Lawrence on the cover of Time, 1937.

Drawings of Albert Einstein and Paul Painleve discussing mathematics at the College de France in 1921.

Einstein’s messy desk  at Princeton, 1955. 

A portrait of Dr. Chien-Shiung Wu, popularly known as Madame Wu, at Columbia University, 1952.

The oldest item I could find is not physics-related but I thought it deserved a mention:  this 1754 engraving of Sir Francis Drake being knighted by Queen Elizabeth I.

 In related news, Cosmic Variance has dug up photos of unsung astronomy hero Walter Baade and other astronomical grooviness.

Glennda Chui

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Particle physics gives boost to areas of Latin American

November 18, 2008 | 1:26 pm

In the quest to improve the quality of life in developing countries, people focus on key barometers of affluence: literacy rates, affordable food supplies, poverty rates, and long life spans. Few people think about science, particularly the esoteric branch of high-energy particle physics, as a grassroots growth engine.

One of 1600 water detectors that are part of the Pierre Auger Observatory.

But it can be. A good example is the Pierre Auger Observatory in Malargüe, Argentina, a rural area of isolated ranches nestled in pampas at the base of the Andes Mountains.

Fermilab Director Pier Oddone attended the observatory’s inauguration this week and wrote in the daily Fermilab newsletter about the changes the experiment has brought to the area.

There are many notable qualities of the Pierre Auger collaboration and its impact on the community of Malargüe, a town where physicists are rock stars. Politicians take pride in the observatory and have used it to promote Malargüe as a destination for science tourism. A modern conference center, a planetarium and improved schools are all a result of the adoption of physics by political representatives and the local population. The then-mayor of Malargüe, who supported Pierre Auger, is now the governor of Mendoza province after being a senator for Mendoza in Buenos Aires–a meteoric career propelled by cosmic air showers.

As we left Malargüe Sunday morning to return to the U.S., the physicists and staff of Pierre Auger were getting ready to take part in the annual parade celebrating the founding of Malargüe as an independent town. Traditionally, the loudest cheers along the parade are for the Pierre Auger team.

The experiments presence has found its way into everyday life in other small ways. The 1600 cosmic ray detectors spread across 3000 square kilometers of pampas require power. Stringing power lines would cost millions of dollars so instead the collaboration devised a system of solar panels to power the detectors and as backup power supplies at the four communication system locations, which use a somewhat unreliable local power grid.

Local ranchers have noticed the solar panels and their effectiveness.

“Those who can afford it now have solar panels on their buildings,” said Peter Mazur, a physicist on the project. “They supply enough power for small appliances and radios. We see more and more of that. We weren’t see that when we first came there.”

A group of collaborators install the first water detector tank and solar panel

A group of collaborators install the first water detector tank and solar panel

Helping Latin American countries participate in large-scale physics experiments has been a decades-long goal of Fermilab, which has been a big player in managing the Pierre Auger experiment. Members of the laboratory have been recognized numerous times by Latin American groups for their contributions to growing Latin American research.

Former Fermilab director Leon Lederman reached out to Latin American countries 25 years ago to create a broader base for particle physics, which had traditionally been cost-prohibitive for many nations. He launched programs to train theorists and experimentalists at Fermilab as members of large collaborations, through graduate student programs and partnership with Latin American universities. Latin American experimenters now play roles in many of the world’s primary particle physics experiments, including at Fermilab and CERN, bringing knowledge and diversity to the scientific field as well as to their home countries.

More on the Pierre Auger Observatory from symmetry:
Numbers – the observatory in numbers
Let it rain – general feature about the observatory
On the trail of cosmic bullets – some recent scientific results from Pierre Auger

Tona Kunz

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